MCQOPTIONS
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MCQOPTIONS
This section includes 40 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Calculate the limiting error of an ammeter of range 0-25 A given also that it has a guaranteed accuracy of 1% of full-scale reading. The current measured by the ammeter is 5 A. |
| A. | 2% |
| B. | 2.5% |
| C. | 4% |
| D. | 5% |
| Answer» E. | |
| 2. |
A 200 V PMMC voltmeter is specified to be accurate within ±2% of full scale. The limiting error, when the instrument is used to measure a voltage of 100 V, is |
| A. | ±8% |
| B. | ±4% |
| C. | ±2% |
| D. | ±1% |
| Answer» C. ±2% | |
| 3. |
A current of 2 ± 0.5% A passes through a resistor of 100 ± 0.2% Ω. The limiting error in the computation of power will be |
| A. | 0.7% |
| B. | 0.9% |
| C. | 1.2% |
| D. | 1.5% |
| Answer» D. 1.5% | |
| 4. |
A tangent galvanometer is a: |
| A. | integrating instrument |
| B. | indicating instrument |
| C. | absolute instrument |
| D. | secondary instrument |
| Answer» D. secondary instrument | |
| 5. |
In a current measurement exercise the standard deviation is 4 mA. Calculate probable error. |
| A. | 3.7 mA |
| B. | 3 mA |
| C. | 4 mA |
| D. | 2.7 mA |
| Answer» E. | |
| 6. |
A temperature sensor having a range of 0-100°C has a worst case accuracy specification of ± 1.0% of true value of ± 0.3% of full scale, whichever is higher. The sensitivity of the sensor is experimentally obtained by taking its readings at true temperatures 25°C and 75°C. The maximum error in sensitivity, expressed as percentage of its ideal value is |
| A. | ± 0.105% |
| B. | ± 0.21% |
| C. | ± 1.05% |
| D. | ± 2.1% |
| Answer» D. ± 2.1% | |
| 7. |
Direction: It consists of two statements, one labeled as ‘Statement (I)’ and the others as ‘Statement (II)’. You are to examine these two statements carefully and select the answer using the codes given below:Statement (I): For random error with Normal distribution, probable error = ± 0.6745 σ, where σ is the standard deviation.Statement (II): Probable error ξρ is that error value where there is a 50% chance that any observation has a random error no grater than ± ξρ |
| A. | Both Statement (I) and Statement (II) are individually true and Statement (II) is the correct explanation of Statement (I) |
| B. | Both Statement (I) and Statement (II) are individually true but Statement (II) is NOT the correct explanation of Statement (I) |
| C. | Statement (I) is true but Statement (II) is false |
| D. | Statement (I) is false but Statement (II) is true |
| Answer» B. Both Statement (I) and Statement (II) are individually true but Statement (II) is NOT the correct explanation of Statement (I) | |
| 8. |
Directions: It consists of two statements, one labeled as the 'Statement (I)' and the other as 'Statement (II)'. Examine these two statements carefully and select the answer using the codes given below:Statement (I): If the limiting errors of measurement of power consumed by and the current passing through resistance are ±1.5 % and ±1.0 % respectively, then the limiting error of resistance measurement will be ±2.5 %.Statement (II): Mathematically if f = xyz, Then Δf = (Δx) yz + x(Δy) z + xy(Δz) |
| A. | Both Statement (I) and Statement (II) are individually true and Statement (II) is the correct explanation of Statement (I) |
| B. | Both Statement (I) and Statement (II) are individually true but Statement (II) is NOT the correct explanation of Statement (I) |
| C. | Statement (I) is true but Statement (II) is false |
| D. | Statement (I) is false but Statement (II) is true |
| Answer» E. | |
| 9. |
In an ac main, the rms voltage Vac, rms current Iac and power Wac are measured as: Vac = 100 V ± 1%, Iac = 1 A ± 1% and Wac = 50 W ± 2% (errors are with respect to readings). The percentage error in calculating the power factor using these readings is |
| A. | 1% |
| B. | 2% |
| C. | 3% |
| D. | 4% |
| Answer» E. | |
| 10. |
An ammeter of 0-50 A range has an accuracy of ± 1% of full scale reading. The current measured is 10 A. The uncertainty in measured value is |
| A. | ± 2% |
| B. | ± 2.5% |
| C. | ± 4% |
| D. | ± 5% |
| Answer» E. | |
| 11. |
A 300 V voltmeter has an accuracy of ± 2% of full-scale deflection. When the reading is 222 V, the actual voltage – |
| A. | lies between 217.56 and 226.44 V |
| B. | lies between 217.4 and 226.6 V |
| C. | lies between 216 and 228 V |
| D. | is exact 222 V |
| Answer» D. is exact 222 V | |
| 12. |
Null type recorders are __________ recorders. |
| A. | potentiometric |
| B. | bridge |
| C. | LVDT |
| D. | Any of these |
| Answer» E. | |
| 13. |
A voltmeter, having a guaranteed accuracy of 1%, reads 9 V on a 0 V to 150 V range full-scale reading. The percentage limiting error is |
| A. | 0.167% |
| B. | 1.67% |
| C. | 16.7% |
| D. | 0.0167% |
| Answer» D. 0.0167% | |
| 14. |
Errors that occur after taking care of all gross and systematic errors are called as: |
| A. | Environmental errors |
| B. | Limiting errors |
| C. | Instrumental errors |
| D. | Random errors |
| Answer» E. | |
| 15. |
A multimeter has full scale deflection current 5 mA, then it sensitivity is: |
| A. | 100 Ω/V |
| B. | 200 Ω/V |
| C. | 300 Ω/V |
| D. | 400 Ω/V |
| Answer» C. 300 Ω/V | |
| 16. |
An ammeter of 0-25 A range has a guaranteed accuracy of 1% of full-scale reading. The current measured is 5 A. The limiting error is |
| A. | 0.05 |
| B. | 0.04 |
| C. | 0.025 |
| D. | 0.02 |
| Answer» B. 0.04 | |
| 17. |
A 0-150 V voltmeter has a guaranteed accuracy of 1% of full-scale reading. The voltage measured by this instrument is 75 V. The limiting error will be |
| A. | 5% |
| B. | 4% |
| C. | 3% |
| D. | 2% |
| Answer» E. | |
| 18. |
In a transducer, the observed output deviates from the correct value by a constant factor. The resulting error is called _______ |
| A. | zero error |
| B. | nonconformity error |
| C. | sensitivity error |
| D. | hysteresis error |
| Answer» D. hysteresis error | |
| 19. |
Errors in the readings of measuring instruments due to friction, hysteresis or gear backlash are called: |
| A. | random errors |
| B. | environmental errors |
| C. | instrumental errors |
| D. | observational errors |
| Answer» D. observational errors | |
| 20. |
A voltmeter reads 40 V on its 100 V range and an ammeter reads 75 mA on its 150 mA range in a circuit. Both the instruments are guaranteed ± 2% accuracy on FSD. The limiting error on the measured power is |
| A. | 4% |
| B. | 5% |
| C. | 9% |
| D. | 12% |
| Answer» D. 12% | |
| 21. |
Match List - I (Term) with List - II (statement) and select the correct answer using the code given below the Lists:List - IA. CalibrationB. ThresholdC. ReliabilityD. Loading List - II1. Error caused by the act of measurement on the system.2. Degree of repeatability continues to remain within specified limits.3. The process of making adjustments on the scale so that the instrument readings conform to an accepted standard.4. Minimum amount of input required for a measuring instrument to react. |
| A. | A - 1 B - 4 C - 2 D - 3 |
| B. | A - 3 B - 4 C - 1 D - 2 |
| C. | A - 4 B - 3 C - 2 D - 1 |
| D. | A - 3 B - 4 C - 2 D - 1 |
| Answer» E. | |
| 22. |
In measurement, the difference between the true value and indicated value of a quantity is called: |
| A. | Dynamic error |
| B. | Absolute error |
| C. | Gross error |
| D. | Relative error |
| Answer» C. Gross error | |
| 23. |
A meter has a full scale angle of 90° at a current of 1 A. This meter has perfect square-law response. What is the current when the deflection angle is 45°? |
| A. | 0.5 A |
| B. | 0.25 A |
| C. | 0.707 A |
| D. | 0.67 A |
| Answer» D. 0.67 A | |
| 24. |
Material used for making knife switch is |
| A. | nickel |
| B. | aluminium |
| C. | brass |
| D. | nichrome |
| Answer» D. nichrome | |
| 25. |
An energy meter is: |
| A. | An indicating instrument |
| B. | An integrating instrument |
| C. | A recording instrument |
| D. | An absolute instrument |
| Answer» C. A recording instrument | |
| 26. |
In case of overdamping, the instrument will become |
| A. | Oscillating |
| B. | Dead |
| C. | Fast and sensitive |
| D. | Slow and lethargic |
| Answer» E. | |
| 27. |
Industrial measuring instruments are of accuracy classes |
| A. | 0.5 and 1 |
| B. | 0.5, 1, 1.5, 2.5 and 5 |
| C. | 1, 1.5, 2.5 and 5 |
| D. | 1.0, 0.2 and 0.5 |
| Answer» B. 0.5, 1, 1.5, 2.5 and 5 | |
| 28. |
A thermometer reads 95.45°C and the static correction given in the correction curve is –0.08°C. The true value of temperature will be |
| A. | 95.37°C |
| B. | 95.45°C |
| C. | 95.65°C |
| D. | 95.73°C |
| Answer» B. 95.45°C | |
| 29. |
Calculate the scale span of the instrument that is calibrated between 20 bar and 200 bar and used for the measurement of pressure. |
| A. | 20 bar |
| B. | 180 bar |
| C. | 190 bar |
| D. | 220 bar |
| Answer» C. 190 bar | |
| 30. |
Perfect reproducibility means the instrument has: |
| A. | No drift |
| B. | High accuracy |
| C. | Maximum drift |
| D. | Minimum accuracy |
| Answer» B. High accuracy | |
| 31. |
Error due to improper zero adjustment is classified as |
| A. | Environment error |
| B. | Instrument error |
| C. | Random error |
| D. | Operator error |
| Answer» C. Random error | |
| 32. |
A.d.c. voltmeter has a sensitivity of 1000 Ω/Volt, When it measures half full scale in 100 V range, the current through the voltmeter will be: |
| A. | 50 mA |
| B. | 100 mA |
| C. | 1 mA |
| D. | 0.5 mA |
| Answer» E. | |
| 33. |
Four independent observations recorded voltage measurement of 110.02 V, 110.11 V, 110.08 V and 110.03 V. The average range of error will be |
| A. | 110.06 V |
| B. | 0.05 V |
| C. | ± 0.045 V |
| D. | ± 0.9 V |
| Answer» D. ± 0.9 V | |
| 34. |
A null type of instrument as compared to a deflecting type instrument has |
| A. | Higher accuracy |
| B. | Lower sensitivity |
| C. | Faster response |
| D. | All of the above |
| Answer» B. Lower sensitivity | |
| 35. |
Determine the value of current (in mA) required for the full-scale deflection of a voltmeter when the sensitivity of the voltmeter is 125 Ohms/Volt. |
| A. | 2 |
| B. | 4 |
| C. | 8 |
| D. | 10 |
| Answer» D. 10 | |
| 36. |
Match the following list:List - IList – II(a) Amplidyne(i) Three axes device(b) Resolver(ii) Dynamo-electric amplifier(c) Gyroscope(iii) Rotatory transformer(d) Accelerometer(iv) Inertial measurement Correct code are: |
| A. | (a) – (i), (b) – (iii), (c) – (ii), (d) – (iv) |
| B. | (a) – (ii), (b) – (i), (c) – (iv), (d) – (iii) |
| C. | (a) – (ii), (b) – (iii), (c) – (i), (d) – (iv) |
| D. | (a) – (i), (b) – (ii), (c) – (iii), (d) – (iv) |
| Answer» D. (a) – (i), (b) – (ii), (c) – (iii), (d) – (iv) | |
| 37. |
If a zero-centred voltmeter has a scale from – 5V to +5V, then the span of it is _____. |
| A. | 0 V |
| B. | 10 V |
| C. | 5 V |
| D. | –5 V |
| Answer» C. 5 V | |
| 38. |
If the measurement of a quantity involves the product of readings of two instruments which have systematic errors x1 % and x2 %, then the systematic error in the measurement of the quantity is approximately |
| A. | (x1 + x2) % |
| B. | (x1 x2) % |
| C. | (x1 / x2) % |
| D. | (x2 / x1) % |
| Answer» B. (x1 x2) % | |
| 39. |
A set of independent current measurements are recorded as 10.03, 10.10, 10.11 and 10.08 A. Calculate (a) average current, and (b) range of error |
| A. | a = 10.08 A, b = ± 0.04 A |
| B. | a = 10.08 A, b = ± 0.05 A |
| C. | a = 10.05 A, b = ± 0.05 A |
| D. | a = 10.05 A, b = ± 0.04 A |
| Answer» B. a = 10.08 A, b = ± 0.05 A | |
| 40. |
A 0-200 V voltmeter has an accuracy of 0.75% of full-scale reading. If the voltage measured is 100 V, the error is |
| A. | 3% |
| B. | 2% |
| C. | 1.5% |
| D. | 0.75% |
| Answer» D. 0.75% | |